Proceedings

EPJ E Highlight - Thermodiffusion in weightlessness

alt
Flow pattern 2 min after the start of vibrations. © Y. Gaponenko et al.

Zero gravity experiments on the International Space Station shed some light on thermodiffusion effects, relevant to the oil and gas industry and global warming prevention processes

Thermodiffusion, also called the Soret effect, is a mechanism by which an imposed temperature difference establishes a concentration difference within a mixture. Two studies by Belgian scientists from the Free University of Brussels, recently published in EPJ E, provide a better understanding of such effects. They build on recent experimental results from the IVIDIL—Influence Vibration on Diffusion in Liquids—research project performed on the International Space Station under microgravity to avoid motion in the liquids.

In the first study, using a mathematical model the authors set out to identify how vibrations applied to a binary liquid mixture change the temperature and concentration fields over a long time scale. Their findings pave the way for studying multi-component mixtures in orbit. By extending the findings to ternary mixtures, this study also has implications for the generation of models used, for example, to evaluate the economic value of oil reservoirs for the oil and gas industry.

However, there is still a lack of data for systems with a negative Soret effect—when thermodiffusion makes the denser component migrate to the hotter region. The authors of the second paper use numerical models to study the establishment of the concentration field near the critical region, where diffusion strongly diminishes. Surprisingly, they demonstrate that the component separation through the Soret effect is saturated and not infinite, and is reached surprisingly rapidly. At the same time, the authors are developing an instrument using what is known as the Taylor dispersion technique— which is not sensitive to gravity—to measure the thermodiffusion near the critical point in a laboratory.

The second study could therefore contribute to developing technology to prevent increases in the CO2 concentration in the atmosphere associated with global warming. Indeed, the process of capturing CO2 near large power plants burning fossil fuels involves its subsequent reinjection in disused underground oil or gas reservoirs. The key is that CO2 containing aggressive impurities, such as sulfur dioxide and hydrogen sulphide, is injected in a supercritical state into the geothermal field. The findings of the second study may help determine whether the Soret effect could lead to a very large accumulation of concentrated aggressive components, capable of creating a leak in the initially impervious cap-rock of the reservoir.

Experimental and numerical analysis of mass transfer in a binary mixture with Soret effect in the presence of weak convection. Y. Gaponenko, A. Mialdun, V. Shevtsova (2014), Eur. Phys. J. E 37: 90, DOI 10.1140/epje/i2014-14090-5

Soret separation in a binary liquid mixture near its critical temperature. J.C. Legros, Yu. Gaponenko, T. Lyubimova and V. Shevtsova (2014), Eur. Phys. J. E 37: 89, DOI 10.1140/epje/i2014-14089-x

This was our first experience of publishing with EPJ Web of Conferences. We contacted the publisher in the middle of September, just one month prior to the Conference, but everything went through smoothly. We have had published MNPS Proceedings with different publishers in the past, and would like to tell that the EPJ Web of Conferences team was probably the best, very quick, helpful and interactive. Typically, we were getting responses from EPJ Web of Conferences team within less than an hour and have had help at every production stage.
We are very thankful to Solange Guenot, Web of Conferences Publishing Editor, and Isabelle Houlbert, Web of Conferences Production Editor, for their support. These ladies are top-level professionals, who made a great contribution to the success of this issue. We are fully satisfied with the publication of the Conference Proceedings and are looking forward to further cooperation. The publication was very fast, easy and of high quality. My colleagues and I strongly recommend EPJ Web of Conferences to anyone, who is interested in quick high-quality publication of conference proceedings.

On behalf of the Organizing and Program Committees and Editorial Team of MNPS-2019, Dr. Alexey B. Nadykto, Moscow State Technological University “STANKIN”, Moscow, Russia. EPJ Web of Conferences vol. 224 (2019)

ISSN: 2100-014X (Electronic Edition)

© EDP Sciences